Algae on Gravel Pebbles

Hi,
I have an area of gravel path in the back garden which is shaded by a
couple of large conifers. Over the last year or so, the gravel pebbles
appear to be picking up a greenish tinge, presumably algae from the trees?
Is there anything I can use to return the pebbles to their original
colour, or is it a case of removing and replacing?
Thanks for reading.
Steve

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